Wynca — Zhejiang Xinan Chemical Industrial Group
浙江新安化工集团股份有限公司
Wynca is a silicon-materials group whose catalogue names two potting silicones for PV junction boxes. The grade most module makers will look at, EncapSil5202GW, is produced by its subsidiary Zhejiang Lide.
Supplier at a glance
- Location
- Jiande, Zhejiang
- Equipment listed here
- PV junction-box potting materials
- PV grades
- EncapSil5202GW for PV junction-box potting; GelSil2471 for thin-film PV junction boxes. [2]
- Producer of EncapSil5202GW
- Zhejiang Lide, listed in the 2025 annual report with a 51% direct group holding. [4]
- Profile sources
- 4 named sources; source list
Company scope
What the company makes
Zhejiang Xinan Chemical Industrial Group (浙江新安化工集团股份有限公司) trades as Wynca. It traces its business back to 1965 and listed its shares in 2001. The group runs crop protection and silicon materials as separate businesses, and the silicon side covers a chain from mineral resources and smelting through monomers to finished silicone products. For PV module plants, the useful part is a small set of junction-box potting compounds; Wynca sells no crystal-growth machines, wafers or full module material kits.
Two grades in the Wynca encapsulant table are assigned to PV. EncapSil5202GW, a two-part alkoxy silicone, is the grade listed for potting standard PV junction boxes. GelSil2471 is a two-part polyaddition material for junction boxes on thin-film modules. Each has its own chemistry and process.
The EncapSil5202GW technical sheet names 浙江励德有机硅材料有限公司, Zhejiang Lide, as the producer. Wynca's 2025 annual report lists Lide as a subsidiary with a 51% direct holding. Settle early which company quotes, which one makes the batch and which one issues the safety sheet and release certificate.
For a potting trial, the sheet gives a 6:1 weight ratio for A and B, separate working and gel times, and instructions for re-stirring components that settle in storage. The group website shows one address for the silicone business and a footer mail link that points elsewhere, so confirm the contracting and shipping entity in the order.
Equipment portfolio
Start with the actual equipment
The entries below cover selected products and series from this manufacturer. Ask for the full catalogue if your project needs other models.
EncapSil5202GW PV junction-box potting silicone →
EncapSil5202GW is a white two-part alkoxy silicone for potting PV module junction boxes. Mix A and B 6:1 by weight; at 23°C and 55% RH it gives 16 minutes of working time and gels in 29 minutes, curing to 43 Shore A.… [3]
Specifications & selection questions →Group, subsidiary and order roles
Group, producer and contract: who does what
| Company or document | What it states | Ask for your order |
|---|---|---|
| Registered company | Zhejiang Xinan Chemical Industrial Group, trading as Wynca. | Which legal entity will quote and invoice? |
| EncapSil5202GW sheet | Producer: Zhejiang Lide Silicone Materials. | Who makes and releases your batch? |
| 2025 annual report | Zhejiang Lide held 51% directly by the group. | Does the grade reach you through the group or through Lide? |
| Corporate headquarters | Wynca gives a Jiande head-office contact. | Where are production, quality control and technical support for this grade? |
If you plan a factory visit, ask Wynca which Lide site makes your grade. [1][3][4]
Match the paperwork
Your quotation, the latest TDS, the SDS, each batch certificate and the A/B labels should all name the same product and producer. If Wynca contracts while Lide produces, get in writing who handles technical support and change notices. [3][4]
Pick the grade for your box
Two PV potting grades with different chemistries
EncapSil5202GW: alkoxy, room-temperature cure
A white, flowable two-part alkoxy silicone listed for PV junction-box potting. It mixes 6:1 by weight and cures by condensation at room temperature. Quote the full GW suffix; the neighbouring EncapSil5202XG-2 is a ferrite-bead protection grade. [2][3]
GelSil2471: polyaddition for thin-film boxes
A blue, flowable two-part polyaddition silicone assigned to junction boxes on thin-film modules. Its cure chemistry differs from the GW grade, so ask for its own process sheet and compatibility data if you consider it. [2]
Rest of the silicone range
Wynca's range also holds thermal pads and gels, coatings, adhesives and further encapsulants for IGBT, PTC, cabinet and ferrite-bead uses. Those grades are specified for their own jobs. Frame bonding and module encapsulation film call for different materials again. [2]
Running EncapSil5202GW on your line
A potting trial built around mixing, degassing and cure
Fix the grade and sheet revision
Check that the A/B labels read EncapSil5202GW. The sheet shows a 2022-01-25 revision date while its document code ends in 2023; ask Lide which revision is current and controlled. [3]
Re-stir, then weigh
Settled components need stirring one at a time before they meet. After that, weigh A and B at 6:1. Ask Lide for dispenser settings and a check for even dosing. [3]
Mix fully and degas
Stir in one direction, scrape the sides and bottom of the container, and pull a vacuum after pouring to remove air. The sheet sets no vacuum level or time, so agree both for your box and electronics. [3]
Allow for climate
Working and gel times are measured at 23°C and 55% RH. Lide notes that heat and humidity shift cure speed and suggests checking cure rate on arrival in each region and season. Set full-cure and release checks for your real assembly. [3]
Flame, thermal and storage points
Qualify the grade inside the box you ship
UL flame statement
The sheet mentions UL flame certification without a file number, rating or specimen thickness. Get those details and check they cover the GW grade at your potting depth before you cite them. [3]
Thermal and electrical figures
Thermal conductivity, dielectric strength and resistivity describe the cured silicone itself. Diode temperature and insulation performance depend on your box geometry and parts, so share drawings, substrates and the tests you intend to run. [3]
Project fit
Match the offering to your project
Module makers selecting a named potting grade for PV junction boxes.
Plants that can control weighed dosing, vacuum degassing and cure checks on their own boxes.
Buyers who want the contracting company and the producing subsidiary named separately in the order.
Confirm before ordering
- The current controlled TDS revision, plus full-cure time and vacuum settings for your box depth.
- The UL file that applies, junction-box qualification results and a certificate for each shipped batch.
- The Lide plant that makes your grade and a sales contact who answers for it.
Drawn from Wynca's English group page, its encapsulant grade table, the two-page EncapSil5202GW sheet and the 2025 annual report, page 199 included.
Certificates & approvals
Approvals on file
No factory audit or equipment certificate is on file for this manufacturer yet. Ask for current certificates, with their scope and validity, in your quotation request.
Prepare before contacting
Your EncapSil5202GW PV junction-box potting silicone enquiry checklist
Tick the questions that apply to your project, then take them into your sourcing request. Ticking an item here does not contact the manufacturer.
Your selections remain on this page and are cleared on reload. Download or print to keep a copy. No checklist selections are uploaded.
Continue to sourcing requestBuyer questions
Does Wynca make EncapSil5202GW itself?
The sheet names Zhejiang Lide as producer, and the annual report shows the group holding 51% of Lide directly. Ask which company contracts and which produces your order. [3][4]
Can I use GelSil2471 data for EncapSil5202GW?
No. One is polyaddition, the other alkoxy, and the table assigns them to different boxes. Work from each grade's own sheet. [2][3]
Does Wynca supply EVA film or laminators?
Neither appears in the potting table or the GW sheet. Wynca's PV entries here cover junction-box silicone. [2][3]
Is the UL certification on file?
The sheet states UL flame certification. Request the file number, flame rating and tested thickness with the quotation. [3]
Sources
Where this information comes from
Two PV junction-box potting grades; EncapSil5202GW comes from Zhejiang Lide, and its current sheet and flame file belong in the quote.
Company facts come from the publications listed below, each with the date it was checked. The project-fit notes and enquiry checklist are our buying guidance.
- Wynca group introduction ↗Manufacturer website · Checked Checked 2026-10-11
Group history, silicon business and head-office contact.
- Wynca encapsulant grade table ↗Manufacturer product table · Checked Checked 2026-10-11
Encapsulant grades with chemistry and intended use, including both PV grades.
- EncapSil5202GW technical sheet ↗Two-page manufacturer PDF · Checked Checked 2026-10-11
Producer name, test results, mixing and handling instructions, and the revision date and document code.
- Wynca 2025 annual report ↗Annual report on CNINFO · Checked Checked 2026-10-11, page 199 included
Company identity and the 51% direct holding in Zhejiang Lide.
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